To get the number of rows : multi_dim_array_with_contents.length;
This function will return number 3 which is the number of rows.

To get the number of columns in each rows : multi_dim_array_with_contents[i].length;
' i ' stands for the row number.

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IMPORTANT NOTICE

All the circuits, published in this blog is only after testing and getting proper results in my private lab. When you try these circuits, you should check the supply voltage, polarity of components, presence of childrens nearby and shorts in the circuits. This website will not be responsible for any harm happened to you or your components caused by your carelessness.